Remarques sur les révisions

New in 4.1
* Ported the "extract" post-treatment from version 3.
This programs can extract from a backup the sequence and the list of all
proteins for every individual in an easily parsable text-based format.
* aevol_modify allows to modify the axis features and segmentation as well as
secretion properties
* Added man pages for the 4 main executables
Bugs fixed in 4.1
* Supressed memory leaks
* Introduced in 4.0: Major bias in the spatial competition caused by a bad
update.
* In aevol_modify, changing environment gaussians was causing a segfault when
NOT using environmental variations.
* Bug #279: make install no longer fails with error